TL F 5811
DS7837DS8837
Hex
Unified
Bus
Receiver
February 1996
DS7837 DS8837 Hex Unified Bus Receiver
General Description
The DS7837 DS8837 are high speed receivers designed for
use in bus organized data transmission systems intercon-
nected by terminated 120X impedance lines The external
termination is intended to be 180X resistor from the bus to
the
a
5V logic supply together with a 390X resistor from the
bus to ground The receiver design employs a built-in input
hysteresis providing substantial noise immunity Low input
current allows up to 27 driver receiver pairs to utilize a com-
mon bus Disable inputs provide time discrimination Disable
inputs and receiver outputs are TTL compatible Perform-
ance is optimized for systems with bus rise and fall times
s
1 0 ms V
Features
Y
Low receiver input current for normal V
CC
or V
CC
e
0V
(15 mA typ)
Y
Six separate receivers per package
Y
Built-in receiver input hysteresis (1V typ)
Y
High receiver noise immunity (2V typ)
Y
Temperature insensitive receiver input thresholds track
bus logic levels
Y
TTL compatible disable and output
Y
Molded or cavity dual-in-line or flat package
Y
High speed
Typical Application
TL F 5811 1
Connection Diagram
Dual-In-Line Package
TL F 5811 2
Top View
Order Number DS7837J DS8837M or DS8837N
See NS Package Number J16A M16A or N16A
C1996 National Semiconductor Corporation
RRD-B30M36 Printed in U S A
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Absolute Maximum Ratings
(Note 1)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Operating Temperature Range
DS7837
b
55 C to
a
125 C
DS8837
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
Maximum Power Dissipation at 25 C
Cavity Package
1433 mW
Molded DIP Package
1362 mW
SO Package
1002 mW
Lead Temperature (Soldering 4 seconds)
260 C
Derate cavity package 9 6 mW C above 25 C derate molded DIP package
10 9 mW C above 25 C derate SO package 8 01 mW C above 25 C
Operating Conditions
Min
Max
Units
Supply Voltage (V
CC
)
DS7837
4 5
5 5
V
DS8837
4 75
5 25
V
Temperature (T
A
)
DS7837
b
55
a
125
C
DS8837
0
a
70
C
Electrical Characteristics
The following apply for V
MIN
s
V
CC
s
V
MAX
T
MIN
s
T
A
s
T
MAX
unless otherwise specified (Notes 2 and 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
TH
High Level Receiver Threshold
V
CC
e
Max
DS7837
1 65
2 25
2 65
V
DS8837
1 80
2 25
2 50
V
V
TL
Low Level Receiver Threshold
V
CC
e
Min
DS7837
0 97
1 30
1 63
V
DS8837
1 05
1 30
1 55
V
I
IH
Maximum Receiver Input Current
V
IN
e
4V
V
CC
e
V
MAX
15 0
50 0
m
A
V
CC
e
0V
1 0
50 0
m
A
I
IL
Logical ``0'' Receiver Input Current
V
IN
e
0 4V V
CC
e
V
MAX
1 0
50 0
m
A
V
IH
Logical ``1'' Input Voltage
Disable
2 0
V
V
IL
Logical ``0'' Input Voltage
Disable
0 8
V
I
IH
Logical ``1'' Input Current
Disable Input
V
IND
e
2 4V
80 0
m
A
V
IND
e
5 5V
2 0
mA
I
IL
Logical ``0'' Input Current
V
IN
e
4V V
IND
e
0 4V Disable Input
b
3 2
mA
V
OH
Logical ``1'' Output Voltage
V
IN
e
0 5V V
IND
e
0 8V
2 4
V
I
OH
e b
400 mA
V
OL
Logical ``0'' Output Voltage
V
IN
e
4V V
IND
e
0 8V I
OH
e
16 mA
0 25
0 4
V
I
OS
Output Short Circuit Current
V
IN
e
0 5V V
IND
e
0V V
OS
e
0V
b
18 0
b
55 0
mA
V
CC
e
V
MAX
(Note 4)
I
CC
Power Supply Current
V
IN
e
4V V
IND
e
0V (Per Package)
45 0
60 0
mA
V
CL
Input Clamp Diode
V
IN
e b
12 mA V
IND
e b
12 mA
b
1 0
b
1 5
V
T
A
e
25 C
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2
Switching Characteristics
T
A
e
25 C nominal power supplies unless otherwise noted
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
pd
Propagation Delays
V
IND
e
0V
Input to Logical ``1'' Output (Note 5)
20
30
ns
Receiver
Input to Logical ``0'' Output (Note 6)
18
30
ns
Input
e
0V
Input to Logical ``1'' Output
9
15
ns
Disable (Note 7)
Input to Logical ``0'' Output
4
10
ns
Note 1
``Absolute Maximum Ratings'' are those values beyond which the safety of the device cannot be guaranteed Except for ``Operating Temperature Range''
they are not meant to imply that the devices should be operated at these limits The table of ``Electrical Characteristics'' provides conditions for actual device
operation
Note 2
Unless otherwise specified min max limits apply across the
b
55 C to
a
125 C temperature range for the DS7837 and across the 0 C to
a
70 C range for
the DS8837 All typical values are for T
A
e
25 C and V
CC
e
5V
Note 3
All currents into device pins shown as positive out of device pins as negative all voltages referenced to ground unless otherwise noted All values shown
as max or min on absolute value basis
Note 4
Only one output at a time should be shorted
Note 5
Fan-out of 10 load C
LOAD
e
15 pF total Measured from V
IN
e
1 3V to V
OUT
e
1 5V V
IN
e
0V to 3V pulse
Note 6
Fan-out of 10 load C
LOAD
e
15 pF total Measured from V
IN
e
2 3V to V
OUT
e
1 5V V
IN
e
0V to 3V pulse
Note 7
Fan-out of 10 load C
LOAD
e
15 pF total Measured from V
IN
e
1 5V to V
OUT
e
1 5V V
IN
e
0V to 3V pulse
Physical Dimensions
inches (millimeters)
Ceramic Dual-In-Line Package (J)
Order Number DS7837J
NS Package Number J16A
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3
DS7837DS8837
Hex
Unified
Bus
Receiver
Physical Dimensions
inches (millimeters) (Continued)
SO Package (M)
Order Number DS8837M
NS Package Number M16A
Molded Dual-In-Line Package (N)
Order Number DS8837N
NS Package Number N16A
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be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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